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Key points that steel casting products are popular

Le 6 November 2013, 07:43 dans Humeurs 0

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investment casting products:

A quick introduction to grey iron castings

Le 6 November 2013, 07:16 dans Humeurs 0

A type of cast iron, the name of grey iron is derived not only from the basic elemental composition of the material, but also from the coloring of fractured surfaces of the metal. This method is commonly used to distinguish between iron alloys though the molecular structure is also very different. Even within the category of grey casting there are several different types, such as ductile valve casting and spheroidal graphite cast iron, based on molecular composition and internal structure. Even minor differences lead to considerable variation of the many desirable features of grey iron such as low melting point, resistance to deformation and wear, energy dissipation and thermal conductivity.

Making up 5% of the Earth's crust and 35% of its total mass, iron is the most copious element on the planet. Rarely found in pure form, however, iron oxides or iron ores must be mined and processed to produce grey iron. Metalworkers achieve this through the use of a special type of blast furnace known as a cupola or an electric induction furnace. Though several standardized grading systems are available, the general composition of grey cast iron gear is 95% iron by weight with an additional 2.1 to 4% being carbon and 1 to 3% silicon. Manganese and other impurities are also commonly found in or added to molten iron as needed for the diminishing or enhancement of specific properties or casting manufacturers. Sulfur, for example, is commonly introduced to the molten metal in order to increase hardness which is otherwise low in most cast iron components. Specific to grey cast iron is a high amount of silicone which is responsible for the production of graphite when the alloyed materials are heated. The deflection of this graphitic microstructure is what gives the metal its grey appearance. Though most often in flake form, ductile cast iron production slows down the growth of graphite and allows the carbon to separate as spheroidal graphite particles instead. Both the timing and temperature play important roles in the structural disposition of grey iron castings.


elevator casting parts:

The way to create production flow in investment casting

Le 6 November 2013, 07:07 dans Humeurs 0

The term 'investment casting' refers to a process for making machine parts, tools and other precision metal instruments that are cast in wax; the wax is then dipped in ceramic. After the ceramic dries, the wax is burned away. The resulting mold can make up to 50,000 identical pieces, according to American Casting Foundry. This was once a lengthy and expensive process, but new production flow methods have made the process much faster and more affordable.

1.Obtain a steel prototype of the product that has been made to exact specifications. Investment casting makes precise replicas, so make sure the prototype perfectly represents the piece that will be manufactured.

2.Create an aluminum die or mold of the piece to be manufactured. Coat the prototype with a thin layer of grease, then place it halfway into the molten aluminum alloy; allow the aluminum to cool. The greased prototype lifts out easily from the dried aluminum mold. Place the other half of the prototype in molten aluminum and allow it to cool. The result is two halves that, when put together, form a negative image of the prototype. The halfway marks must be carefully measured so that you know the resulting mold halves represent the exact size of the prototype when placed together. Check the die for any flaws or inaccuracies.

3.Melt the metal alloy you're using to make the final part. Start the melting process as you make the aluminum die so the the metal alloy will be ready to pour when you need it.

4.Make wax patterns from the aluminum die. Pour the wax into the die and let it dry. This is a wax duplicate of the prototype.

5.Dip the wax in liquid ceramic. Let the ceramic dry for 48 hours. Melt out the wax by placing the ceramic/wax piece in an electric furnace at 180 degrees to 250 degrees Fahrenheit. Pour out the wax: You have a shell you'll pour the melted metal alloy into.

6.Pour the liquid metal alloy into the ceramic mold. Allow the alloy to become solid, then break away the ceramic mold. The resulting part is your final product.

7.Inspect the final product. Any corrections that require tooling --- using fine metal files, awls or chisels to remove imperfections --- should be made at this stage. Flawed pieces should be discarded.


aluminum die casting:

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